The Granville-Phillips 275203 Convection Gauge, manufactured by Helix Technology Corporation, is an industry-standard vacuum measurement instrument renowned for its reliability and precision. Built with a durable stainless steel body and featuring a distinctive blue connector interface, this gauge is designed to provide accurate and repeatable pressure readings in demanding laboratory and industrial vacuum environments. For accurate heat transfer measurement and to meet strict factory performance specifications, the device must be installed in a horizontal orientation. Manufactured in Longmont, Colorado, USA, this convection gauge ensures optimal vacuum system monitoring. Note: To prevent the possibility of injury, the gauge must always be used in accordance with the manufacturer’s instructions for use.